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一、背景阐述比与比例是对事物间关系的一种描述和运用。对于小学生而言,这样的描述还是抽象和难以理解的。在教学比例的意义的时候,教材依次按照比例的意义和基本性质、正反比例的意义、比例的应用三个大板块编排。教材列举了很多平时常见的数量关系,借助一些具体的问题情境层层阐释比例的知识结构。按照教材的编排,比例的应用应该是前两个教学
First, the background ratio and ratio is a description of the relationship between things and use. For primary school students, this description is abstract and difficult to understand. In the meaning of the proportion of teaching time, textbooks in accordance with the significance of the proportion and the basic nature of the positive and negative proportion of the proportion of the application of three large plate choreography. The textbook lists a number of common normal relations of quantity, with some specific questions context explaining the proportion of knowledge structure. In accordance with the textbook layout, the proportion of applications should be the first two teaching